JSTests/test262/test/language/expressions/arrow-function/dstr/dflt-obj-ptrn-prop-obj-init.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/obj-ptrn-prop-obj-init.case
// - src/dstr-binding/default/arrow-function-dflt.template
/*---
description: Object binding pattern with "nested" object binding pattern using initializer (arrow function expression (default parameter))
esid: sec-arrow-function-definitions-runtime-semantics-evaluation
features: [destructuring-binding, default-parameters]
flags: [generated]
info: |
    ArrowFunction : ArrowParameters => ConciseBody

    [...]
    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
    [...]

    9.2.1 [[Call]] ( thisArgument, argumentsList)

    [...]
    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
    [...]

    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )

    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
    [...]

    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)

    [...]
    23. Let iteratorRecord be Record {[[iterator]]:
        CreateListIterator(argumentsList), [[done]]: false}.
    24. If hasDuplicates is true, then
        [...]
    25. Else,
        b. Let formalStatus be IteratorBindingInitialization for formals with
           iteratorRecord and env as arguments.
    [...]

    13.3.3.7 Runtime Semantics: KeyedBindingInitialization

    [...]
    3. If Initializer is present and v is undefined, then
       a. Let defaultValue be the result of evaluating Initializer.
       b. Let v be GetValue(defaultValue).
       c. ReturnIfAbrupt(v).
    4. Return the result of performing BindingInitialization for BindingPattern
       passing v and environment as arguments.
---*/

var callCount = 0;
var f;
f = ({ w: { x, y, z } = { x: 4, y: 5, z: 6 } } = { w: undefined }) => {
  assert.sameValue(x, 4);
  assert.sameValue(y, 5);
  assert.sameValue(z, 6);

  assert.throws(ReferenceError, function() {
    w;
  });
  callCount = callCount + 1;
};

f();
assert.sameValue(callCount, 1, 'arrow function invoked exactly once');